[cleanup] fix SpreadCalls perf-test names in JSTests.json

test/js-perf-test/JSTests.json

 {
   "name": "JSTests",
   "run_count": 5,
   "run_count_android_arm": 3,
   "run_count_android_arm64": 3,
   "units": "score",
   "total": true,
   "resources": ["base.js"],
   "tests": [
     {
       "name": "SpreadCalls",
       "path": ["SpreadCalls"],
       "main": "run.js",
       "resources": ["spreadcalls.js"],
       "flags": ["--harmony-spreadcalls"],
       "run_count": 5,
       "units": "score",
       "results_regexp": "^%s\\-SpreadCalls\\(Score\\): (.+)$",
       "tests": [
-        {"name": "Call-Sum"},
-        {"name": "CallMethod-Sum"},
-        {"name": "CallNew-Sum"}
+        {"name": "Call"},
+        {"name": "CallMethod"},
+        {"name": "CallNew"}
       ]
     },
     {
       "name": "Classes",
       "path": ["Classes"],
       "main": "run.js",
       "resources": ["super.js", "default-constructor.js"],
       "flags": ["--harmony-classes"],
       "results_regexp": "^%s\\-Classes\\(Score\\): (.+)$",
       "tests": [
@@ skipping 57 matching lines @@
       "results_regexp": "^%s\\-Templates\\(Score\\): (.+)$",
       "total": true,
       "tests": [
         {"name": "Untagged"},
         {"name": "LargeUntagged"},
         {"name": "Tagged"}
       ]
     }
   ]
 }